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authorEric Dumazet <edumazet@google.com>2018-06-20 05:18:50 +0300
committerDavid S. Miller <davem@davemloft.net>2018-06-20 08:30:06 +0300
commit12b03558cef6d655d0d394f5e98a6fd07c1f6c0f (patch)
treef576cdaa802418e9eee3625d613ffd8a4d0f1609 /drivers/net
parent8b26a06ad4f2a12425f1f63a0ee57f42961dfd1e (diff)
downloadlinux-12b03558cef6d655d0d394f5e98a6fd07c1f6c0f.tar.xz
net: sungem: fix rx checksum support
After commit 88078d98d1bb ("net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends"), sungem owners reported the infamous "eth0: hw csum failure" message. CHECKSUM_COMPLETE has in fact never worked for this driver, but this was masked by the fact that upper stacks had to strip the FCS, and therefore skb->ip_summed was set back to CHECKSUM_NONE before my recent change. Driver configures a number of bytes to skip when the chip computes the checksum, and for some reason only half of the Ethernet header was skipped. Then a second problem is that we should strip the FCS by default, unless the driver is updated to eventually support NETIF_F_RXFCS in the future. Finally, a driver should check if NETIF_F_RXCSUM feature is enabled or not, so that the admin can turn off rx checksum if wanted. Many thanks to Andreas Schwab and Mathieu Malaterre for their help in debugging this issue. Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Meelis Roos <mroos@linux.ee> Reported-by: Mathieu Malaterre <malat@debian.org> Reported-by: Andreas Schwab <schwab@linux-m68k.org> Tested-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/ethernet/sun/sungem.c22
1 files changed, 12 insertions, 10 deletions
diff --git a/drivers/net/ethernet/sun/sungem.c b/drivers/net/ethernet/sun/sungem.c
index 7a16d40a72d1..b9221fc1674d 100644
--- a/drivers/net/ethernet/sun/sungem.c
+++ b/drivers/net/ethernet/sun/sungem.c
@@ -60,8 +60,7 @@
#include <linux/sungem_phy.h>
#include "sungem.h"
-/* Stripping FCS is causing problems, disabled for now */
-#undef STRIP_FCS
+#define STRIP_FCS
#define DEFAULT_MSG (NETIF_MSG_DRV | \
NETIF_MSG_PROBE | \
@@ -435,7 +434,7 @@ static int gem_rxmac_reset(struct gem *gp)
writel(desc_dma & 0xffffffff, gp->regs + RXDMA_DBLOW);
writel(RX_RING_SIZE - 4, gp->regs + RXDMA_KICK);
val = (RXDMA_CFG_BASE | (RX_OFFSET << 10) |
- ((14 / 2) << 13) | RXDMA_CFG_FTHRESH_128);
+ (ETH_HLEN << 13) | RXDMA_CFG_FTHRESH_128);
writel(val, gp->regs + RXDMA_CFG);
if (readl(gp->regs + GREG_BIFCFG) & GREG_BIFCFG_M66EN)
writel(((5 & RXDMA_BLANK_IPKTS) |
@@ -760,7 +759,6 @@ static int gem_rx(struct gem *gp, int work_to_do)
struct net_device *dev = gp->dev;
int entry, drops, work_done = 0;
u32 done;
- __sum16 csum;
if (netif_msg_rx_status(gp))
printk(KERN_DEBUG "%s: rx interrupt, done: %d, rx_new: %d\n",
@@ -855,9 +853,13 @@ static int gem_rx(struct gem *gp, int work_to_do)
skb = copy_skb;
}
- csum = (__force __sum16)htons((status & RXDCTRL_TCPCSUM) ^ 0xffff);
- skb->csum = csum_unfold(csum);
- skb->ip_summed = CHECKSUM_COMPLETE;
+ if (likely(dev->features & NETIF_F_RXCSUM)) {
+ __sum16 csum;
+
+ csum = (__force __sum16)htons((status & RXDCTRL_TCPCSUM) ^ 0xffff);
+ skb->csum = csum_unfold(csum);
+ skb->ip_summed = CHECKSUM_COMPLETE;
+ }
skb->protocol = eth_type_trans(skb, gp->dev);
napi_gro_receive(&gp->napi, skb);
@@ -1761,7 +1763,7 @@ static void gem_init_dma(struct gem *gp)
writel(0, gp->regs + TXDMA_KICK);
val = (RXDMA_CFG_BASE | (RX_OFFSET << 10) |
- ((14 / 2) << 13) | RXDMA_CFG_FTHRESH_128);
+ (ETH_HLEN << 13) | RXDMA_CFG_FTHRESH_128);
writel(val, gp->regs + RXDMA_CFG);
writel(desc_dma >> 32, gp->regs + RXDMA_DBHI);
@@ -2985,8 +2987,8 @@ static int gem_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
pci_set_drvdata(pdev, dev);
/* We can do scatter/gather and HW checksum */
- dev->hw_features = NETIF_F_SG | NETIF_F_HW_CSUM;
- dev->features |= dev->hw_features | NETIF_F_RXCSUM;
+ dev->hw_features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
+ dev->features = dev->hw_features;
if (pci_using_dac)
dev->features |= NETIF_F_HIGHDMA;